Synthesis and Fluorescence Properties of Novel Pyrazine-Boron Complexes Bearing a β-Iminoketone Ligand

A novel fluorescence dye based on pyrazine-boron complexes bearing a beta-iminoketone ligand has been synthesized by using a simple two-step reaction. Synthesized complexes exhibited fluorescence in solution (F-max: 472-604 nm) and in the solid state (F-max: 496-624 nm). These complexes showed a larger Stokes shift(3690-4900 cm(-1)) than well-known boron dipyrromethene dyes (400-600 cm(-1), in most cases).